Opening the menu at the California Grill at Walt Disney World’s Contemporary Resort overlooking the Magic Kingdom, I expected to giggle at the affordability of everything. I’m a New Yorker. Nothing out here in the sticks costs as much as it does back home, right? Instead, I found $19 glasses of wine and a $75 rib-eye. If you’re a person of average means, a trip to Disney World could leave you bippity-boppity broke. Disney World, that enchanted land of middle class dreams, isn’t so middle-class anymore. So why is it more popular than ever? Fort Mickey is exhibit A for...